<feat: New release>

common/lib/src/util/matchmaker.dart

@@ -4,29 +4,75 @@ import 'dart:io';
 import 'package:ini/ini.dart';
 
 import 'package:reboot_common/common.dart';
+import 'package:sync/semaphore.dart';
 
 final matchmakerDirectory = Directory("${assetsDirectory.path}\\matchmaker");
 final matchmakerStartExecutable = File("${matchmakerDirectory.path}\\fortmatchmaker.exe");
 final matchmakerKillExecutable =  File("${authenticatorDirectory.path}\\kill.bat");
+final matchmakerConfigFile = File("${authenticatorDirectory.path}\\Config\\config.ini");
+String? _lastIp;
+String? _lastPort;
+Semaphore _semaphore = Semaphore();
 
 Future<int> startEmbeddedMatchmaker(bool detached) async => startBackgroundProcess(
     executable: matchmakerStartExecutable,
     window: detached
 );
 
-Future<void> writeMatchmakingIp(String text) async {
-  var file = File("${authenticatorDirectory}\\Config\\config.ini");
-  if(!file.existsSync()){
+Stream<String?> watchMatchmakingIp() async* {
+  if(!matchmakerConfigFile.existsSync()){
     return;
   }
 
+  var observer = matchmakerConfigFile.parent.watch(events: FileSystemEvent.modify);
+  yield* observer.where((event) => event.path == matchmakerConfigFile.path).asyncMap((event) async {
+    try {
+      var config = Config.fromString(await matchmakerConfigFile.readAsString());
+      var ip = config.get("GameServer", "ip");
+      if(ip == null) {
+        return null;
+      }
+
+      var port = config.get("GameServer", "port");
+      if(port == null) {
+        return null;
+      }
+
+      if(_lastIp == ip && _lastPort == port) {
+        return null;
+      }
+
+      return port == kDefaultGameServerPort ? ip : "$ip:$port";
+    }finally {
+      try {
+        _semaphore.release();
+      } on StateError catch(_) {
+        // Intended behaviour
+      }
+    }
+  });
+}
+
+Future<void> writeMatchmakingIp(String text) async {
+  var exists = await matchmakerConfigFile.exists();
+  if(!exists) {
+    return;
+  }
+
+  _semaphore.acquire();
   var splitIndex = text.indexOf(":");
   var ip = splitIndex != -1 ? text.substring(0, splitIndex) : text;
   var port = splitIndex != -1 ? text.substring(splitIndex + 1) : kDefaultGameServerPort;
-  var config = Config.fromString(file.readAsStringSync());
+  if(port.isBlank) {
+    port = kDefaultGameServerPort;
+  }
+
+  _lastIp = ip;
+  _lastPort = port;
+  var config = Config.fromString(await matchmakerConfigFile.readAsString());
   config.set("GameServer", "ip", ip);
   config.set("GameServer", "port", port);
-  file.writeAsStringSync(config.toString());
+  await matchmakerConfigFile.writeAsString(config.toString(), flush: true);
 }
 
 Future<bool> isMatchmakerPortFree() async => isPortFree(int.parse(kDefaultMatchmakerPort));
@@ -86,3 +132,18 @@ String? _getHostName(String host) => host.replaceFirst("ws://", "").replaceFirst
 
 String? _getScheme(String host) => host.startsWith("ws://") ? "ws" : host.startsWith("wss://") ? "wss" : null;
 
+extension StringExtension on String {
+  bool get isBlank {
+    if(isEmpty) {
+      return true;
+    }
+
+    for(var char in this.split("")) {
+      if(char != " ") {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}